Periodicity Quiz
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5 questions, one answer each
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1. Which Period 3 element has the highest melting temperature?
- A. Aluminium
- B. Silicon
- C. Sulfur
- D. Argon
2. Why is the first ionisation energy of sulfur lower than that of phosphorus?
- A. Sulfur has fewer protons
- B. Sulfur has a larger atomic radius
- C. Sulfur's outer electron is in a 3s sub-shell
- D. Two electrons share one 3p orbital in sulfur and repel each other
3. Which forces are overcome when chlorine melts?
- A. London forces between Cl₂ molecules
- B. Covalent bonds within Cl₂
- C. Ionic bonds
- D. Metallic bonds
4. How does atomic radius change from sodium to chlorine, and why?
- A. It increases because the nuclear charge increases
- B. It increases because shielding increases
- C. It decreases because the nuclear charge increases with similar shielding
- D. It stays the same
5. Which is the correct order of increasing melting temperature?
- A. S₈ < P₄ < Cl₂
- B. Cl₂ < P₄ < S₈
- C. P₄ < Cl₂ < S₈
- D. Cl₂ < S₈ < P₄